Technologies for Next Generation Optical Access Network

Introduction of the GE-PON system has accelerated the use of FTTH in Japan, changing the access network from simply an Internet connection to a social infrastructure that provides services directly related to daily life, such as IP telephone service. Mitsubishi Electric has the largest share of the GE-PON market in Japan and is now working on the next generation GE-PON. The role of the NGN is becoming increasingly important as the communication network is expected to provide rich content such as real-time applications including video communications. Along with this trend, the next generation optical access system requires new features including (1) Links to service-related functions such as QoS for smooth use of different applications and bandwidth control function; (2) Link function for full IP communication and broadcasting that are highly compatible with the NGN; and (3) Measures to prevent the digital divide in local areas. This paper discusses these technological challenges, their solutions, and the technologies required for realizing coexistence with GE-PON for standardization toward second-generation FTTH currently under way. Development efforts for Next Generation optical access system As the GE-PON system is now widely used, the number of FTTH users in Japan is steadily increasing. In the near future, a high-grade QoS function will have to be installed in the access network with an eye toward the NGN. The optical network, which is already part of the social infrastructure, will have to incorporate measures against the digital divide by extending the service range.